Police in Portland, Oregon, have been accused of being heavy-handed with people protesting against a rally by extreme-right demonstrators.
The city’s new police chief has ordered a review of officers’ use of force after some counter-protesters were reportedly injured during the demonstration.
Police in riot gear tried to keep the two groups apart on Saturday, many of whom had come dressed for battle in helmets and protective clothing.
Dozens of the extreme-right protesters were bussed to Portland, one of America’s most liberal cities, from nearby Vancouver, Washington.
Saturday’s clashes were the most recent of several this year in the city as right-wing militants converged, met by counter-protesters, including members of anti-fascist, or “antifa” groups.
City officials have struggled with striking a balance between free speech and keeping events from spiralling out of control.
But on Saturday, some said police seemed to act mostly against those protesting against the presence of the extreme-right demonstrators, using stun grenades and what appeared to be rubber bullets against them.